This bug has been in the game for over 2 years at least; if there is already a ticket for this, I apologize. That being said, this glitch happens when you are either driving a car and hit a curb or a random small obstacle, or when you enter a car. There is no warning for when it happens. I have a short 30 second clip of this happening: https://clips.twitch.tv/EnchantingBlightedCrabsNononoCat-GalBfAweFd6PXvr6